Vibration mitigation mechanism and effect of ballast mats for over-track buildings on metro depot

被引：0
作者：
Cao Z.-G. [1 ]
Wang S.-Q. [1 ]
Xu Y.-F. [1 ]
Bai X.-D. [1 ]
Yuan Z.-H. [2 ]
Ma X.-F. [3 ]
机构：
[1] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou
[2] Institute of Geotechnical Engineering, Zhejiang University of Technology, Hangzhou
[3] Hangzhou Dongsheng Real Estate Limited Company, Hangzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2023年 / 57卷 / 01期
关键词：
ballast mat; isolation effectiveness; metro depot; over-track building;
D O I：
10.3785/j.issn.1008-973X.2023.01.008
中图分类号：
学科分类号：
摘要：
The vibration responses of track structures in the throat area and test line (with ballast mats) and those of over-track buildings at Hangzhou metro depot were tested in order to analyze the vibration mitigation effect of ballast mats on over-track buildings. A three-dimensional fully-coupled dynamic model of train-track-soil-pile-building was established by considering the interaction between pile and soil. The model revealed the vibration propagation laws of over-track buildings caused by train in the metro deport and the mitigation mechanism of ballast mats on over-track buildings. The influence of stiffness of ballast mats on vibration mitigation effect under different train speeds was analyzed. Results showed that the main frequency range of ground floor vibration was 40-80 Hz, and the high frequency component obviously attenuated with story height. The main frequency range of the vibration of the top floor of the building was 20-40 Hz, and the low frequency component tended to increase with the height of the building. Ballast mats had a good vibration mitigation effect on the over-track building with the increase of frequency. The maximum insertion loss of structures reached 7-12 dB in the frequency band above 40 Hz. The higher speed of the train, the smaller stiffness of ballast mats, the better the vibration mitigation effect of the ballast mats on over-track buildings would be. Compression deformation and vibration mitigation effect were considered. It was recommended that the stiffness range of ballast mats was 0.012-0.024 N/mm3. © 2023 Zhejiang University. All rights reserved.
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页码：71 / 80
页数：9
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